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Financing Activities - Narrative (Details) |  |  | 1 Months Ended | 3 Months Ended | 9 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Sep. 30, 2024 USD ($) aircraft | May 01, 2020 USD ($) $ / shares | Jun. 30, 2024 USD ($) | Sep. 30, 2024 USD ($) aircraft | Jun. 30, 2024 USD ($) | Sep. 30, 2023 USD ($) | Mar. 31, 2023 USD ($) aircraft | Sep. 30, 2024 USD ($) aircraft | Sep. 30, 2023 USD ($) | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($) aircraft | Dec. 05, 2022 aircraft | Dec. 31, 2021 USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Value of warrant repurchase and termination |  |  | $ 6,000,000 | $ 0 | $ 6,000,000 | $ 0 |  | $ 6,000,000 | $ 0 |  |  |  |
Capital expenditures |  |  |  | 517,000,000 |  | 842,000,000 |  | 1,594,000,000 | 2,812,000,000 |  |  |  |
Payments of long-term debt and finance lease obligations |  |  |  | $ 11,000,000 |  | 11,000,000 |  | $ 27,000,000 | 78,000,000 |  |  |  |
Boeing 737-700 | Air Transportation Equipment |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of aircrafts to be purchased | aircraft |  |  |  |  |  |  |  |  |  |  |  | 39 |
Number of aircrafts purchased | aircraft |  |  |  |  |  |  | 8 |  |  |  | 31 |  |
Capital expenditures |  |  |  |  |  |  | $ 88,000,000 |  |  |  |  |  |
Payments of long-term debt and finance lease obligations |  |  |  |  |  |  | $ 50,000,000 |  |  |  |  |  |
Total lease obligations |  |  |  |  |  | 38,000,000 |  |  | 38,000,000 |  |  |  |
Number of leased aircrafts | aircraft | 19 |  |  | 19 |  |  |  | 19 |  |  |  |  |
Gain (loss) on sale of leased aircraft |  |  |  |  |  |  |  | $ 0 |  |  |  |  |
Convertible Debt |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount | $ 1,600,000,000 | $ 2,300,000,000 |  | $ 1,600,000,000 |  |  |  | $ 1,600,000,000 |  | $ 1,600,000,000 |  |  |
Conversion ratio | 0.0271951 | 0.0259909 |  |  |  |  |  |  |  |  |  |  |
Initial conversion price (in USD per share) | $ / shares |  | $ 38.48 |  |  |  |  |  |  |  |  |  |  |
Principal amount of debt repurchased |  |  |  |  |  |  |  |  |  |  | $ 689,000,000 |  | $ 689,000,000
Term (in years) |  |  |  |  |  |  |  | 5 years |  |  |  |  |
Convertible Debt | 1.25% Convertible Notes due 2025 |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Amounts outstanding | $ 1,611,000,000 |  |  | $ 1,611,000,000 |  |  |  | $ 1,611,000,000 |  |  |  |  |
Convertible Debt | 1.25% Convertible Notes due 2025 | Level 2 |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Stated interest rate | 1.25% | 1.25% |  | 1.25% |  |  |  | 1.25% |  |  |  |  |
Line of Credit |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowing capacity | $ 1,000,000,000 |  |  | $ 1,000,000,000 |  |  |  | $ 1,000,000,000 |  |  |  |  |
Amounts outstanding | $ 0 |  |  | $ 0 |  | $ 0 |  | $ 0 | $ 0 |  |  |  |
Notes Due 2027 |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Effective interest rate | 1.90% |  |  | 1.90% |  |  |  | 1.90% |  |  |  |  |

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